The right time to tell people you're pregnant

I'm 10 weeks pregnant and my mum and gran are telling everyone I know that I'm pregnant. It's really starting to annoy me cause I feel like it's too early plus I had a miscarriage last year and they done the same thing and it was shit trying to tell everyone afterwards. I told them at the start of this pregnancy that I want to tell people in my own time but they just won't listen. What should I do???